环境因素对斜拉桥拉索振动基频的影响  

INFLUENCE OF ENVIRONMENTAL FACTORS UPON FUNDAMENTAL VIBRATION FREQUENCY OF CABLES FOR CABLE-STAYED BRIDGE

作　　者：吉伯海[1] 程苗[1] 傅中秋[1] 赵端端[1] 孙媛媛[1] 

机构地区：[1]河海大学土木与交通学院,南京210098

出　　处：《工业建筑》2013年第11期121-125,共5页Industrial Construction

基　　金：国家自然科学基金资助项目(51278166);高等学校博士学科点专项科研基金项目(20120094110009);江苏省交通厅科研资助项目(2011Y09-1;2013Y13)

摘　　要：基于斜拉桥拉索有限元模型,分析了考虑拉索工程参数时阻尼器、梁体振动和温度三种环境因素对拉索振动基频的影响。结果表明:当阻尼器安装位置一定时,阻尼器对长索的基频影响大于短索的基频;当索长和阻尼器位置一定时,阻尼器对截面直径大的拉索基频的影响小于截面直径小的拉索基频;由于车辆荷载导致斜拉桥梁体振动,使得拉索的基频存在动态波动,因此在索力测量时,应选择车辆较少的时段以获得更加准确的基频;高温和低温均影响拉索基频,即拉索温度越高,基频越小;拉索温度越低,基频越大。Based on the finite element model of cable for cable-stayed bridge, it was analyzed the influence of three environmental factors including damper, beam vibration and temperature upon the cable＇ s vibration fundamental frequency when considering engineering parameters of cable. The results show that when the damper＇ s installation position is fixed, the influence of the damper upon the long cable＇ s fundamental frequency is greater than the influence upon the short cable＇ s. When the cable＇s length and the damper＇s position are fixed, the influence of the damper upon the fundamental frequency of the cable which has large section diameter is less than the one has small section diameter. The fundamental frequency of the cable has dynamic fluctuations because of the cable-stayed bridge＇ s beam vibration caused by the vehicle load. To make the fundamental frequency more accurate, the time with a few vehicles may be selected when measuring the cable force. Temperature variation also has influence upon the fundamental frequency of the cable. Namely, the higher of the cable＇ s temperature, the smaller of the fundamental frequency ; the lower of the cable＇ s temoerature, the bigger of the fundamental frequency.

关 键 词：频率法 基频 阻尼器 梁体振动 温度 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]